<template>

  <div class="app-container">
    <!-- 输入表单 -->
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name"/>
      </el-form-item>
      <el-form-item label="入驻时间">
        <el-date-picker v-model="teacher.joinDate" value-format="yyyy-MM-dd"/>
      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" :min="0"/>
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
            -->
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro"/>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career" :rows="10" type="textarea"/>
      </el-form-item>

      <!-- 讲师头像 -->
      <el-form-item label="讲师头像">
        <el-upload
          :show-file-list="false"
          :on-success="handleAvatarSuccess"
          :before-upload="beforeAvatarUpload"
          :on-error="handleAvatarError"
          :action="BASE_API+'/admin/vod/file/upload?module=avatar'"
          class="avatar-uploader">
          <img v-if="teacher.avatar" :src="teacher.avatar">
          <i v-else class="el-icon-plus avatar-uploader-icon"/>
        </el-upload>
      </el-form-item>

      <el-form-item>
        <el-button type="primary" @click="saveOrUpdate()">保存</el-button>
      </el-form-item>
    </el-form>

  </div>

</template>

<script>

    import teacherApi from '@/api/vod/teacher'

    export default {
        data() {
            return {
                BASE_API: 'http://localhost:9001',
                // 初始化讲师默认数据
                teacher: {
                    sort: 0,
                    level: 1
                },
                saveBtnDisabled: false // 保存按钮是否禁用，防止表单重复提交
            }
        }, created() {

            if (this.$route.params.id){
                const id =  this.$route.params.id;
                this.fetchDataById(id);
            }


        },methods:{

            // 上传成功回调
            handleAvatarSuccess(res, file) {
                // console.log(res)
                if (res.code==200) {
                    // console.log(res)
                    this.teacher.avatar = res.data
                    // 强制重新渲染
                    this.$forceUpdate()
                } else {
                    this.$message.error('上传失败 （非0）')
                }
            },

// 错误处理
            handleAvatarError() {
                console.log('error')
                this.$message.error('上传失败（http失败）')
            },

// 上传校验
            beforeAvatarUpload(file) {
                const isJPG = file.type === 'image/jpeg'
                const isLt2M = file.size / 1024 / 1024 < 2

                if (!isJPG) {
                    this.$message.error('上传头像图片只能是 JPG 格式!')
                }
                if (!isLt2M) {
                    this.$message.error('上传头像图片大小不能超过 2MB!')
                }
                return isJPG && isLt2M
            },

            //根据id查询讲师
            fetchDataById(id){
                teacherApi.getById(id).then(response =>{
                    this.teacher = response.data
                })
            },
            //修改
            save(){
                // 添加
                teacherApi.saveTeacher(this.teacher).then(response =>{
                    this.$message({
                        type: 'success',
                        message :'添加成功'
                    });
                    //跳转页面
                    this.$router.push({path:'/vod/teacher/list'})
                })
            },
            //修改
            update(){
                teacherApi.updateTeacher(this.teacher).then(response => {
                    this.$message({
                        type: 'success',
                        message :'修改成功'
                    });
                    this.$router.push({path:'/vod/teacher/list'})
                })
            },

            //保存
            saveOrUpdate(){
                if (this.teacher.id){  //有id
                    this.update()
                }else {   //没有id
                    this.save()
                }
            },

        }
    }
</script>

<style scoped>

</style>
